Because Ukraine was fighting on it's own territory, not the territory of the enemy. Just today, Ukrainians have blown up the Russian arms silo the size of a small town, and I don't doubt that a lot of Russian civilians have died. There's also been a lot of casualties around Kursk. There's been a lot of civilian casualties in different attacks on Crimea too. Quite a few people died when Ukrainians attacked the Crimea bridge.

And, of course, Ukranians are within their rights and do not break any laws of war. Just as Israelis.

> How come Ukraine is able to put in every effort to avoid civilian death

Ukraine, which regularly shells civilian areas of Belgorod? That Ukraine?

https://www.reuters.com/world/europe/belgorod-city-where-war...

https://www.bbc.com/news/world-europe-62042455

Because of the political will. Russia doesn't care, they never investigate nor prosecute their military for war crimes. Ukraine does.

Literally every week there is a several civilians dead in Belgorod area from Ukraine missiles deliberately fired on residential area.